Using a small open economic model, I investigate the effects of changes in unskilled foreign workers' accessibility to the labor market on their inflow into a small open economy and their participation to the labor market. I assume that legal and illegal unskilled foreign workers move between a small open economy and the rest of the world due to difference in real-consumption wages (nominal wages divided by the consumer price index). However, even if unskilled foreign workers migrate to a small open economy, only a few of them can enter the labor market because of the impediments to unskilled foreign workers participation to the labor market. I show that the inflow of unskilled foreign workers into a small open economy depends on their accessibility to the labor market and it becomes smaller as unskilled foreign workers have more access to the labor market. I also show that the policy authority's utility increases (decreases) as unskilled foreign workers have more access to the labor market, if the ratio of legal unskilled foreign workers is high (low) and unskilled foreign workers' accessibility to the labor market is low (high).